That way it's the same as a standard rocker switch (the direction of rotation is the same).
Last time I was in Europe (Portugal), I remember having a lot of difficulty making sense of the light switches, but it was one of those apartments where you have two or three light switches controlling the same fixture, which is always confusing.
Still, I think the American light switches are actually pretty good. Maybe one day we will get a Technology Connections video about light switches around the world.
This is in the US.
- 'angled towards the ground' is 'On' (https://cdn.aws.toolstation.com/images/141020-UK/800/10481.j...)
- 'angled towards the ceiling' is 'Off' (https://www.tlc-direct.co.uk/Images/Products/size_3/MKK4870....)
In aviation (and old cars) switches are usually toggle switches with "up = on".
Strangely I'm ok with both. I think of rocker switches as opposite to toggle switches automatically.